EFFECT OF PYROLYSIS HEATING RATE ON CHEMICAL COMPOSITION OF WOOD VINEGAR FROM Eucalyptus urograndis) AND Mimosa tenuiflora
Heating rate, wood vinegar, charcoal
Among the parameters used on the biomass carbonization process,the heating velocity presents itself as
one of the most important. In face of it, the purpose of this study was to evaluate the influence of
different heating velocities on the gravimetric yields in charcoal, condensable fluids and non-condensable
gases. The eucalyptus (Eucalyptus urophylla x grandis) and black jurema (Mimosa tenuiflora) woods were
used, shaped as disks with variable diameters and dried. The carbonization occurred in a muffle type
electric oven for three distinct heating velocities: 1.46, 0.97 and 0.73 °C/min.
The BioEstat software version 5.3 was employed to perform the normality test and Shapiro Wilk,
and subsequently the averages were compared by Tukey's test to the 5% significance level.
The collected pyrollenous extract was analyzed by gas chromatography coupled to the mass spectrum ]
(GC-MS). The results showed that smaller heating velocities produce bigger yields in charcoal,
while higher heating velocities lead to bigger yields in condensable fluids.
As well as the increase of the heating rate increased the content of furans and pyran and
decreased the content of phenolic compounds. With this, it is concluded that the choice of
the heating rate should be carried out according to the main interest of the production.